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U.S. Air Force Airmen of the 673d Civil Engineer Squadron construct a guard outpost at Camp Mad Bull at Joint Base Elmendorf-Richardson, Alaska, June 14, 2023. As part of Air Force Force Generation and Agile Combat Employment training, Airmen began building the walls of what will become a guard post during their three-day bivouac exercise. (U.S. Air Force photo by Airman 1st Class Johnny Diaz)